Improvement in cut-offs



f 2 Sheets-Sheet 2. W. SIMS. Y G-ut-Uffs.

rLPErEs, PMOTOLUYHOGRAPHER, WASHINGYON, n C.

NITED STATES PATENT FFICE.

WILLIAM SIMS, OF RIPLEY, OHIO.

' IMPROVEMENT IN ouT-oFFs.

Specification forming part of Letters Patent No. 21] ,799, dated January 28, 1879; application led December 20, 1878.

To all whom t may concern Beit known that I, WILLIAM SII/Is, of Ripley, in the county of Brown and State of Ohio, have invented certain new and useful Improvements in Steam-Engines; andIdo hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, vand to the letters of reference marked thereon, which form part of this specification.

My invention relates to slide-valve en gines; and it consists in the construction and arrangement of a cut-olf attachment for the same, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to` make and use the saine, I will now proceed to describe its construct-ion and operation, referring to the annexed drawing, in which- Figure l is a plan view; Fig. 2, a side elevation and Figs. 3 and 4 are detail sectional views of parts of my engine.

A represents the steam-cylinder, with valvechest B. a. is the piston-rod, connected with the cross-head C, and this cross-head connected by a pitman, D, with a crank on the shaft E. i

F is the slide-valve, provided with an adjustable rod, b, which connects with an arm, d, on a rock-shaft, G.

The shaft E is provided with au eccentric, H, having the usual strap, with adjustable rod I, to act upon a wrist-pin, e, projecting from a lever, J. This lever is slotted, and

the wrist-pin e allowed to be adjusted up andv down in said slot, to regulate the travel ot' valve.

The lever J is pivoted to astud on the frame of the engine, at its lower end, audit is provided with two slotted arms, ff, in each of which is placed a stud, t', with rollers It h placed thereon. These rollers play back and fort-h over cams m m on the ends of a beam, L, secured to the end of the rocking shaft, Gr. Each cam is held to its place by two setscrews, n n, which renders it adjustable. The wrist-pins or studs t' are also adjustable, and held down to the work by set-screws p p from the top, which also take up the wear.

On a quick-workin g engine the rollers h are to be made of iron spools, with one llange screwed on. Between the two flanges are to be put leather rings until the space between the anges is filled up and compressed hard, thus rendering it noiseless. On a slow-moving or long-stroke engine the rollers work smoothly without leather. When these parts are properly adjusted, as soon as the engine passes its center about four inches the steamopening is full open, and then the valve remains stationary until the piston has traveled the desired distance. The valve is then made to move quickly and cut off the steam. TheA piston travels the balance of the stroke by expansion. The valve then moves quick again and throws on a full head. These two quick movements are produced by the action of the rollers h on the cams m.

The cams m are constructed as shown in Fig. 3, and upon their shape depends the proper movement of the valve. As the roller passes over one incline it causes the cut-off, as it passes down the next incline the valve remains stationary, and asv it travels the third incline it gives steam and throws the opposite cam in position to repeat the operation. The rollers 7L are flanged to lit over the cams and impart rmness to the lever.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a cut-off attachment for slide-valves, the combination ot the lever J, carrying the rollers h 7L, with the cams m m on the beam L,

attached to the rocking shaft G, substantially my own I affix my signature in presence of two witnesses.

WILLIAM SIMS.

Witnesses CHAs. ZAUMsEIL, W. MADDoX. 

